Update to new Expo SDK

- removed native-base dependency

data_processing/SwimTrackerWebsocketConnection.js

@@ -6,14 +6,17 @@ const OpCodes = {
     SESSION_STARTED: 2,
     SESSION_STOPPED: 3,
     SESSION_NEW_DATA: 4,
-
+    ANSWER_USER_LIST : 5,
+    ANSWER_SESSION_LIST : 6,
+  
     // from frontend to device
-    START_SESSION: 5,
-    STOP_SESSION: 6,
-    TARE: 7
+    START_SESSION: 7,
+    STOP_SESSION: 8,
+    TARE: 9,
+    QUERY_USER_LIST: 10,
+    QUERY_SESSION_LIST: 11
 };
 
-
 export default class SwimTrackerWebsocketConnection {
     constructor(swimTrackerHost, onData, onStarted, onStopped, onConnect, onDisconnect) {
         this.swimTrackerHost = swimTrackerHost;